I have been inside mobile command posts for MECA (Marion County, Indiana) and the Hendricks County, Indiana, Sheriff's Department. Both of them have a briefing/conference room at the back of the vehicle separate from the radio operators. These "back rooms" have their own outside doors so the command personnel can go in and out without bothering the radio operators.
The downside, in my opinion, of both of these vehicles is that the radio operator positions are all in one room with no attempt at separating them from each other. You'd have to use headphones, which I did not see, to not be disturbed by activity from the other operating positions.
One thing I noticed on one of these vehicles was that just about every vertical surface in the "radio room" was covered with whiteboard material. That made it very easy for radio operators or command personnel to jot down notes that everyone needed to see, such as what talkgroups were being used or the locations of key control points at the emergency site.
